And again a very good example for good lighting composition. Excellent job.
2 little problems: shadow is cut down a bit on the bottom of the picture, and there from the middle of the picture the white-gray transition is not continous.
Nice low-key shot, but the composition is a bit too centered. I do get an ominous feeling from the positioning of the subject, so I think that it meets the challenge well.
Great image...Great use of contrast. One thing I notice is that his arm looks like it may be going up so that his hand is on his forehead. If you could have kept his arm visible with his hand on his forehead, that would have really got your objective across.